I find the folks over at ATI know their converters and they have yet to steer me wrong on many a different build!!!they will work or they will not work. it's like playing lotterie.
I guess for a normal street car it will work for a very good pricing. If you want to have the exact stall speed reffering to your engine and car specs - I would not recommend such a converter.
and yes, I had one on my old 383 engine and it worked fine